Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[mirror_ubuntu-artful-kernel.git] / drivers / s390 / cio / qdio_main.c

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 5640c89cd9de3bae5f6f283f08eda97d7b3c3960..479c665e9e7c25f91996eeb287770384009c9b7a 100644 (file)
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -1508,7 +1508,8 @@ int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
 
        if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
                return -EBUSY;
-
+       if (!count)
+               return 0;
        if (callflags & QDIO_FLAG_SYNC_INPUT)
                return handle_inbound(irq_ptr->input_qs[q_nr],
                                      callflags, bufnr, count);